US4721157A - Fluid sampling apparatus - Google Patents

Fluid sampling apparatus Download PDF

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Publication number
US4721157A
US4721157A US06/862,491 US86249186A US4721157A US 4721157 A US4721157 A US 4721157A US 86249186 A US86249186 A US 86249186A US 4721157 A US4721157 A US 4721157A
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US
United States
Prior art keywords
valve sleeve
bore
fluid
mandrel
tubular housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US06/862,491
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English (en)
Inventor
Vel Berzin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baker Hughes Oilfield Operations LLC
Original Assignee
Baker Oil Tools Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Baker Oil Tools Inc filed Critical Baker Oil Tools Inc
Priority to US06/862,491 priority Critical patent/US4721157A/en
Assigned to BAKER OIL TOOLS, INC. reassignment BAKER OIL TOOLS, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BERZIN, VEL
Priority to DE19873743668 priority patent/DE3743668A1/de
Priority to CH86/88A priority patent/CH677260A5/de
Application granted granted Critical
Publication of US4721157A publication Critical patent/US4721157A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
    • E21B49/081—Obtaining fluid samples or testing fluids, in boreholes or wells with down-hole means for trapping a fluid sample
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
    • E21B49/081—Obtaining fluid samples or testing fluids, in boreholes or wells with down-hole means for trapping a fluid sample
    • E21B49/0815—Sampling valve actuated by tubing pressure changes

Definitions

  • the invention relates to an apparatus for extracting fluid samples from a selected formation of a subterranean well, and particularly to an apparatus for extracting virgin fluid from the selected formation and transferring such fluid to the well surface without contamination.
  • the invention provides an apparatus for extracting a virgin fluid sample from a selected formation traversed by a subterranean well.
  • the sampling apparatus is operatively connected between two packing elements which, if the well is uncased, preferably comprise inflatable packers.
  • Such packers are axially spaced by a distance corresponding to the desired height of the selected formation and, when lowered into the well respectively adjacent the top and bottom ends of the selected formation and expanded into sealing engagement with the well bore, effectively isolate the selected formation from the remainder of the well.
  • An outer tubular housing is provided with one or more radial ports which provide communication with the annulus defined between the walls of the selected well formation and the exterior of the outer tubular housing.
  • An inner tubular assembly is mounted within the outer tubular housing, being secured at its upper end to the outer tubular housing by a connecting sub and extending downwardly to a point beyond the radial sampling port.
  • the inner tubular housing defines a cylindrical bore within which a hollow mandrel is slidably and sealably mounted.
  • the hollow mandrel connects at its upper end with a tubing string extending to the well surface so that fluid pressure may be applied to the interior of the hollow mandrel.
  • the hollow mandrel is at least the same length as the outer tubular housing, and the annular space between the hollow mandrel and the bore of the outer tubular housing defines a collection chamber.
  • Such chamber is closed at its lower end by a bushing which is sealably secured to the outer tubular housing and slidably and sealably engagable with the exterior of the hollow tubular mandrel.
  • a sleeve valve which is mounted in the annulus defined between the bore of the outer tubular housing and the external surface of the inner tubular assembly.
  • a first sealing means on the valve sleeve blocks communication between the radial sampling port and the sampling chamber.
  • the valve sleeve is retained in this blocking position by a shear pin which may be secured to either the outer tubular housing or the inner housing assembly.
  • the internal bore of the valve sleeve cooperates with the exterior of the hollow mandrel to define a fluid pressure chamber.
  • a radial port is provided in the hollow mandrel which, in the run-in position of the apparatus, is straddled by two seal elements respectively provided on the inner tubular assembly and the connecting sub so that fluid pressure within the hollow mandrel cannot be applied to the fluid pressure chamber in the run-in position.
  • the mandrel is shifted downwardly to bring the aforementioned mandrel port into fluid communication with the fluid pressure chamber.
  • the fluid pressure within the bore of the hollow mandrel is increased to cause an upward displacement of the valve sleeve after shearing of the shear pin.
  • Such upward displacement is limited by a stop ring which is shearably secured to the interior of the outer tubular housing.
  • the first sealing means on the valve sleeve which previously blocked communication between the sampling ports and the sampling chamber, is moved to a position above the sampling ports and virgin fluid from the selected formation can flow freely into the sampling chamber which, of course, is maintained at either atmospheric or subatmospheric pressure during the well insertion procedure.
  • the fluid pressure within the hollow mandrel is further increased and this causes a shearing of the stop ring and permits the valve sleeve to move to a second position wherein a second sealing means on the valve sleeve blocks communication between the sampling ports and the top end of the sampling chamber.
  • a unidirectional ratcheting mechanism is provided between the valve sleeve and the inner tubular housing to prevent return movement of the valve sleeve from either its first or second position. Accordingly, the apparatus can now be removed from the well with the fluid sample being completely enclosed and isolated within the fluid sampling chamber.
  • the virgin fluid sample is removed through a discharge passage provided in the bushing that closes the bottom end of the sampling chamber.
  • a discharge passage in the bushing is threaded at its outlet end to receive the threaded neck of a fluid sample bottle and a manually operated valve, which is normally closed, is disposed in such passageway. Opening of the valve will permit the virgin fluid sample to flow by gravity into the collecting bottle without any risk of contamination.
  • FIGS. 1A, 1B, 1C, and 1D collectively constitute a vertical sectional view of a sampling apparatus embodying this invention, with the elements thereof shown in the run-in position.
  • FIGS. 2B and 2C respectively correspond to FIGS. 1B and 1C, but show the elements of the sampling apparatus in the position permitting a flow of well fluid into the sampling chamber.
  • FIGS. 3A, 3B,and 3C respectively correspond to FIGS. 1A, 1B, and 1C, but with the elements thereof shown in the position for withdrawal of the sampling apparatus from the well.
  • FIG. 4 is sectional view taken on the plane 4--4 of FIG. 1D.
  • FIG. 5 is a figure similar to FIG. 4, but illustrating the attachment of a sample bottle to the apparatus after removal from the well.
  • a well fluid-sampling apparatus 1 embodying this invention comprises an outer tubular housing 10 which is conventionally mounted between two retrievable packers (not shown), thus disposing the fluid sampling apparatus adjacent to a selected isolated zone of the well from which a fluid sample is to be extracted.
  • a hollow mandrel 5 extends downwardly through the outer tubular housing 10 and is conventionally connected at its upper end to a tubing string so that axial movement of the mandrel 5 relative to the outer tubular housing 10 may be conveniently effected.
  • Outer tubular housing 10 comprises an upper tubing portion 11 connectable to an upper packer and having its lower end connected by internal threads 11a to an upper connecting sub 12.
  • Upper sub 12 mounts internal O-rings 12c and a wiping seal 12d which engage hollow mandrel 5.
  • Upper connecting sub 12 is provided with external threads 12a on its lower end which are threadably secured to the upper end of an elongated sleeve portion 13.
  • Sleeve portion 13 has a radially inwardly thickened portion 13a at its lower end defining an upwardly facing shoulder 13m. The radially thickened portion 13a terminates in external threads 13c which are sealed by an O-ring 13e and engaged with the top end of a lower sleeve portion 14.
  • the lower end of the lower sleeve portion 14 is provided with internal threads 14a which are secured to the top end of a sample dispensing sub 15. Threads 14a are sealed by an O-ring 15a.
  • the extreme bottom end of dispensing sub 15 has an internally projecting portion 15b in which are mounted O-rings 15 c and a wiper seal 15d, both of which cooperate with the external surface of the hollow mandrel 5.
  • an annular sample fluid-collecting chamber 14b is defined above sample dispensing sub 15.
  • the hollow mandrel 5 may extend downwardly to another tool, if desired, and external threads 15e are provided on the bottom end of the dispensing sub 15 permit the connection thereof to the lower packer.
  • the bore 5a of the hollow mandrel 5 is provided with a conventional removable plug (not shown) so that fluid pressure can be built up within the bore 5a of the hollow mandrel 5.
  • An inner housing assembly 20 is fixedly mounted within the annulus 31 defined between the internal bore surface 13f of the sleeve portion 13 of the outer tubular housing 10 and the exterior of hollow mandrel 5.
  • Inner tubular housing 20 comprises at its upper end a ratcheting sleeve 21 having external threads 21a formed thereon which cooperate with corresponding threads formed in a counterbore 12e formed in the bottom end of the upper connecting sub 12.
  • An O-ring 12f seals the threads 21a.
  • the lower portion of ratchet sleeve 21 is provided with axially spaced ratchet teeth 21b for a purpose to be hereinafter described.
  • ratchet sleeve 21 terminates in an externally threaded, reduced-diameter portion 21c which is threadably engaged with the upper end of a perforated sleeve 22. Additionally, the lower end of ratchet sleeve 21 is provided with a pair of O-rings 21d sealably engaging the exterior of hollow mandrel 5.
  • Perforated sleeve 22 is provided with a plurality of peripherally and axially spaced perforations 22a and terminates at its lower end with internal threads 22b which are threadably engaged with the upper end of a sealing sleeve 24.
  • Sealing sleeve 24 has two sets of axially spaced internal O-rings 24a and 24b and, at its bottom end, a wiper seal 24c engaging the outer periphery of the hollow mandrel 5. Additionally, the sealing sleeve 24 has an external bearing surface 24d which provides bearing support for a piston-type sleeve valve 30 which is mounted in the annulus defined between the outer tubular housing 10 and the inner tubular housing 20.
  • the piston-type sleeve valve assembly 30 comprises a lower sleeve portion having vertically spaced pairs of external O-ring seals 30a and 30b.
  • the piston-type sleeve valve assembly 30 comprises a lower sleeve portion having vertically spaced pairs of external O-ring seals 30a and 30b.
  • the outer sleeve portion 13 has a slightly enlarged-diameter counterbore 13g extending to the bottom end of the sleeve portion 13.
  • the piston-type valve sleeve 30 is provided with an annular recess 30c for a purpose to be hereinafter described.
  • the sleeve portion 13 of the outer tubular housing 10 is provided with one or more radial ports 13d, and it is through these ports that the formation fluid to be sampled flows into the annular fluid-collecting chamber 14b when the piston-type valve sleeve 30 is shifted upwardly relative to the outer tubular housing 10.
  • the top end portion 30d of the piston-type valve sleeve 30 is of increased internal thickness as indicated at 30d, thus defining a downwardly facing shoulder 30e which functions as a piston to effect the movement of the piston-type valve sleeve 30. Additionally, the top end portion 30d mounts a pair of internal O-rings 30k which sealably engage the bottom sleeve portion 21e of the ratcheting sleeve 21.
  • annular fluid pressure chamber 35 is defined intermediate the internal bore of the outer tubular housing 10 and the external surface of the hollow mandrel 5 and that the piston-type valve sleeve 30 is slidably and sealably mounted in the annular fluid pressure chamber.
  • an external shoulder 30m on the piston-type valve sleeve 30 abuts an upwardly facing internal shoulder 40a formed on the bottom end of a positioning sleeve 40.
  • Sleeve 40 is additionally secured to the piston-type valve sleeve 30 by one or more shear screws 40b.
  • the upper end of the positioning sleeve 40 is provided with a stop sleeve 42 (FIG.
  • a stop ring 44 is shearably secured to the interior of the stop sleeve 40 by one or more shear screws 44a.
  • the bottom of stop sleeve 40 abuts shoulder 13m on sleeve portion 13a.
  • a unidirectional latching collet 38 is secured to the top end of the piston-type valve sleeve 30 by a connection sleeve 39 having internal threads 39a engaging external threads on the extreme top end of the piston-type valve sleeve 30.
  • Latching collet 38 has a solid ring portion 38a which is trapped by the inwardly enlarged head portion 39b of the retaining sleeve 39, and upwardly extending, inwardly biased resilient arms 38c terminating in inwardly enlarged head portions 38d which are contoured to effect a unidirectional ratcheting connection with the ratchet teeth 21b provided on the inner housing assembly 20.
  • One or more radial ports 5d are provided in the wall of the hollow mandrel 5 at a position intermediate the internal O-ring seals 12c provided in the connecting sub 12 and the internal O-ring seals 21d provided in the lower portion of the ratcheting sleeve 21 when the mandrel 5 is in its run-in position with respect to the outer tubular housing 10. Suitable shear screws (not shown) secure mandrel 5 in said run-in position.
  • a downward force is applied to the mandrel 5 to shear the shear screws.
  • the hollow mandrel 5 is then moved downwardly with respect to the outer tubular housing 10 until the mandrel ports 5d are brought into general alignment with the perforated sleeve 22.
  • Fluid pressure is then applied to the bore of the hollow mandrel 5 through the tubing string and such fluid pressure flows into the fluid pressure chamber 35, thereby exerting an upward force on the piston-type sleeve valve 30.
  • Such fluid pressure is increased until the shear screws 40b shear, following which the piston-type sleeve valve 30 moves upwardly until the enlarged head portions 38d of the collet 38 engage the stop ring 44.
  • the seals 30a which have previously blocked fluid flow through the sampling ports 13d, are moved to a position above the sampling ports 13d. Fluid flow into the sampling chamber 14b can then readily occur, aided by the annular recess 30c provided on the piston-type sleeve valve 30. The fluid flowing into the sampling chamber 14b is not exposed to contamination by other well fluids or by the fluid utilized to actuate the piston-type sleeve valve 30.
  • the sampling chamber 14b may be maintained at atmospheric pressure as the apparatus is lowered into position in the well or a vacuum may be maintained in the sampling chamber 14d.
  • the sampling chamber may contain a chemical treatment fluid to react with the fluid extracted from the isolated zone of the well.
  • one or more radial ports 13k are provided in the wall of the sleeve portion 13a of the outer tubular housing 10 for filling or draining of the sampling chamber 14b. The ports 13k are sealed by a plug 15 during the operation of the apparatus in the well.
  • the entire apparatus may be removed from the well with the sampling chamber 14b and the well fluid contained therein isolated from contact with any other fluids.
  • the entire apparatus may be removed from the well with the sampling chamber 14b and the well fluid contained therein isolated from contact with any other fluids.
  • sub 15 is provided with a radial fluid removal port 15k which has internal threads 15 m at its outer end to accommodate a plug 17 while the apparatus is in the well, and the threaded neck of a sample-receiving container 16 (FIG. 5) when the apparatus is at the surface.
  • the radial port 15k is normally closed by a manually operable plug valve 18 which is mounted in a transverse bore 15n which intersects the sample outlet port 15k.
  • Plug valve 18 is provided with a pair of external seals 18a and 18b which bracket the outlet port 15k. Additionally, plug 18 is provided with external threads 18c by which the plug can be threadably removed from the bore 15n and thus open the removal port 15k.
  • a plug 19 is inserted in the other end of the bore 15n to prevent loss of fluid through that end of the bore 15n as the plug valve 18 is shifted to its open position.
  • the aforedescribed apparatus provides a simple, economical structure for effecting the removal of virgin fluid from a selected isolated zone of a well by entrapping such virgin fluid within a sampling chamber and effecting the removal of the virgin fluid from the sampling chamber without contamination by any other fluid.
  • an accurate appraisal of the fluid contents of any selected zone of a subterranean well can be accomplished.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Sampling And Sample Adjustment (AREA)
US06/862,491 1986-05-12 1986-05-12 Fluid sampling apparatus Expired - Fee Related US4721157A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US06/862,491 US4721157A (en) 1986-05-12 1986-05-12 Fluid sampling apparatus
DE19873743668 DE3743668A1 (de) 1986-05-12 1987-12-22 Fluidprobenentnahmevorrichtung
CH86/88A CH677260A5 (enrdf_load_stackoverflow) 1986-05-12 1988-01-12

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/862,491 US4721157A (en) 1986-05-12 1986-05-12 Fluid sampling apparatus

Publications (1)

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US4721157A true US4721157A (en) 1988-01-26

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Application Number Title Priority Date Filing Date
US06/862,491 Expired - Fee Related US4721157A (en) 1986-05-12 1986-05-12 Fluid sampling apparatus

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US (1) US4721157A (enrdf_load_stackoverflow)
CH (1) CH677260A5 (enrdf_load_stackoverflow)
DE (1) DE3743668A1 (enrdf_load_stackoverflow)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4979569A (en) * 1989-07-06 1990-12-25 Schlumberger Technology Corporation Dual action valve including at least two pressure responsive members
US5240072A (en) * 1991-09-24 1993-08-31 Halliburton Company Multiple sample annulus pressure responsive sampler
US5337822A (en) * 1990-02-15 1994-08-16 Massie Keith J Well fluid sampling tool
US5361839A (en) * 1993-03-24 1994-11-08 Schlumberger Technology Corporation Full bore sampler including inlet and outlet ports flanking an annular sample chamber and parameter sensor and memory apparatus disposed in said sample chamber
US5368100A (en) * 1993-03-10 1994-11-29 Halliburton Company Coiled tubing actuated sampler
WO2001063093A1 (en) 2000-02-25 2001-08-30 Baker Hughes Incorporated Apparatus and method for controlling well fluid sample pressure
RU2184230C2 (ru) * 2000-08-17 2002-06-27 Открытое акционерное общество "Северо-Кавказский научно-исследовательский проектный институт природных газов" Открытого акционерного общества "Газпром" Устройство для закрытия клапанов глубинного пробоотборника
US6439307B1 (en) 1999-02-25 2002-08-27 Baker Hughes Incorporated Apparatus and method for controlling well fluid sample pressure
WO2004044380A1 (en) 2002-11-12 2004-05-27 Baker Hugues Incorporated A method and apparatus for supercharging downhole sample tanks
WO2004099567A1 (en) 2003-05-02 2004-11-18 Baker Hughes Incorporated Continuous data recorder for a downhole sample tank
US20060076144A1 (en) * 2004-10-13 2006-04-13 Baker Hughes Incorporated Method and apparatus for storing energy and multiplying force to pressurize a downhole fluid sample
US20070119587A1 (en) * 2001-09-19 2007-05-31 Baker Hughes Incorporated Dual Piston, Single Phase Sampling Mechanism and Procedure
US20070214877A1 (en) * 2003-05-21 2007-09-20 Baker Hughes Incorporated Method and apparatus for an optimal pumping rate based on a downhole dew point pressure determination
EP2320026A1 (en) 2003-05-02 2011-05-11 Baker Hughes Incorporated A method and apparatus for a downhole micro-sampler
US10018039B2 (en) 2014-09-19 2018-07-10 Saudi Arabian Oil Company Fast-setting retrievable slim-hole test packer and method of use
US20180348093A1 (en) * 2017-06-06 2018-12-06 United States Department of the Interiori Subsurface Environment Sampler

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102014111984B3 (de) * 2014-08-21 2016-01-21 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Fluidische Gigaohm-Dichtung für Transmembranproteinmessungen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4372382A (en) * 1980-12-15 1983-02-08 Texaco Inc. Method and sampler for collecting a non-pressurized well fluid sample
US4412584A (en) * 1981-04-17 1983-11-01 Halliburton Company Downhole tool intake port assembly
US4502537A (en) * 1983-09-23 1985-03-05 Halliburton Services Annular sample chamber, full bore, APR® sampler
US4597439A (en) * 1985-07-26 1986-07-01 Schlumberger Technology Corporation Full-bore sample-collecting apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4372382A (en) * 1980-12-15 1983-02-08 Texaco Inc. Method and sampler for collecting a non-pressurized well fluid sample
US4412584A (en) * 1981-04-17 1983-11-01 Halliburton Company Downhole tool intake port assembly
US4502537A (en) * 1983-09-23 1985-03-05 Halliburton Services Annular sample chamber, full bore, APR® sampler
US4597439A (en) * 1985-07-26 1986-07-01 Schlumberger Technology Corporation Full-bore sample-collecting apparatus

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4979569A (en) * 1989-07-06 1990-12-25 Schlumberger Technology Corporation Dual action valve including at least two pressure responsive members
US5337822A (en) * 1990-02-15 1994-08-16 Massie Keith J Well fluid sampling tool
US5240072A (en) * 1991-09-24 1993-08-31 Halliburton Company Multiple sample annulus pressure responsive sampler
US5368100A (en) * 1993-03-10 1994-11-29 Halliburton Company Coiled tubing actuated sampler
EP0740049A3 (en) * 1993-03-10 1997-07-02 Halliburton Co Sampling device actuated by coiled tubing
US5361839A (en) * 1993-03-24 1994-11-08 Schlumberger Technology Corporation Full bore sampler including inlet and outlet ports flanking an annular sample chamber and parameter sensor and memory apparatus disposed in said sample chamber
US6439307B1 (en) 1999-02-25 2002-08-27 Baker Hughes Incorporated Apparatus and method for controlling well fluid sample pressure
WO2001063093A1 (en) 2000-02-25 2001-08-30 Baker Hughes Incorporated Apparatus and method for controlling well fluid sample pressure
RU2184230C2 (ru) * 2000-08-17 2002-06-27 Открытое акционерное общество "Северо-Кавказский научно-исследовательский проектный институт природных газов" Открытого акционерного общества "Газпром" Устройство для закрытия клапанов глубинного пробоотборника
US7621325B2 (en) 2001-09-19 2009-11-24 Baker Hughes Incorporated Dual piston, single phase sampling mechanism and procedure
US20070119587A1 (en) * 2001-09-19 2007-05-31 Baker Hughes Incorporated Dual Piston, Single Phase Sampling Mechanism and Procedure
WO2004044380A1 (en) 2002-11-12 2004-05-27 Baker Hugues Incorporated A method and apparatus for supercharging downhole sample tanks
WO2004099567A1 (en) 2003-05-02 2004-11-18 Baker Hughes Incorporated Continuous data recorder for a downhole sample tank
EP2320026A1 (en) 2003-05-02 2011-05-11 Baker Hughes Incorporated A method and apparatus for a downhole micro-sampler
US20070214877A1 (en) * 2003-05-21 2007-09-20 Baker Hughes Incorporated Method and apparatus for an optimal pumping rate based on a downhole dew point pressure determination
US7665354B2 (en) 2003-05-21 2010-02-23 Baker Hughes Incorporated Method and apparatus for an optimal pumping rate based on a downhole dew point pressure determination
US20060076144A1 (en) * 2004-10-13 2006-04-13 Baker Hughes Incorporated Method and apparatus for storing energy and multiplying force to pressurize a downhole fluid sample
US7258167B2 (en) 2004-10-13 2007-08-21 Baker Hughes Incorporated Method and apparatus for storing energy and multiplying force to pressurize a downhole fluid sample
US10018039B2 (en) 2014-09-19 2018-07-10 Saudi Arabian Oil Company Fast-setting retrievable slim-hole test packer and method of use
US20180348093A1 (en) * 2017-06-06 2018-12-06 United States Department of the Interiori Subsurface Environment Sampler
US10704993B2 (en) * 2017-06-06 2020-07-07 United States Of America As Represented By The Secretary Of The Department Of The Interior Subsurface environment sampler with actuator movable collection chamber

Also Published As

Publication number Publication date
DE3743668A1 (de) 1989-07-06
CH677260A5 (enrdf_load_stackoverflow) 1991-04-30

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